Amr500 failure what could cause this? Pics

[Rockbound]

So I recently added an amr500 to my buggy. It’s a bone stock 1600 sp motor. Pit maybe 500 miles if that since the install. Last night it started knocking at high rpm. Pulled it apart today to find the lobes falling apart. See pics. Anyone experience this or have any idea what would cause it? It was oiled properly no loose or wobbly shafts or bearings that I can feel.

[Maxpower]

Looks like it got hot and started to delaminate the lobe coating how fast were you spinning it? Was it a draw through or blow through and I have to ask air filter?

[Rockbound]

[Lo Cash John]

Faulty unit?

How many RPM do you rev the motor?
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[BFB]

they are just cheap Chinese superchargers right? also , what's the ratio of crank and alt pulley, isn't it like 1.5 to 1? and if so that supercharger has to 2 to 1 or more ...
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[clonebug]

The AMR is good for a max of 16,000 rpm if I remember correctly.

Depending on your max rpm that would be a little over 5000 rpm. Doing the math a 2.6:1 ratio would allow you 6000 rpm.

Unfortunately when running a carb and stock distributor you have no way to really tell what AFR or degree advance you are running.
Do you have a boost gauge?
If so how much boost were you running???
More importantly....what were the intake temps at cruise or on boost???

It's not uncommon to see 160 Degree cruising temps or higher. That can happen even when not on boost. Add boost and you can see temps pushing 200 degrees.
8 lbs. boost will add 70 degrees to your ambient temps. So at 80 degrees you can see 150 degrees just with air compression. Now add the temp rise that a blower adds just because.......
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[spencerfvee]

[oprn]

I will start by saying that I have zero experiance running superchargers. I am just going to put some questions out there.

First off is that yes, the damage appears to be heat and/or lack of lube related so the questions in my mind are:

How much lube is required and what kind of oil?

Does that requirement change with the engine at light cruise vs under hard acceleration? Is the oil pumped in at a given rate regardless of engine load?

How much heat does a supercharger generate without adequate flow through? As in how hot does it get without enough air/fuel mixture flowing through it for cooling?

Seems to me that the factory street supercharged cars had a system to disconnect the drive or bypass the supercharger for light loads. Is someone familiar with that?

How much damage has been done to the combustion chambers from the missing bits!
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[Ohio Tom]

All those bits went into the motor. Not good....

AMR's are self lubricated.
My guess is that you sucked something in that cause damage. Once damaged, it just kept eating itself up.

[oprn]

Define self lubricated please. Lubricated by what?
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[FarmerBill]

I've bought a couple of these and while they look good who knows what's going on with them. They all claim to be off low mileage vehicles , or rebuilt, or both, but are they? or are they being cleaned up at a shop thats the Chinese equivalent of GEX? Also these are generally used on low displacement Asian cars (think 600-1000cc) so they don't have to spin as fast to generate boost on those engines as they do on a 1600cc VW. And lastly I assume the cars these run on are fuel injected, so only air passes through the rotors rather than air/fuel mixture. What does gasoline do to the coating on the rotors? What is the coating made of? Lots of questions with these, but hey they're cheap, get another one, and do an autopsy on the first one. I'd love to know what you find.

[Rockbound]

[Rockbound]

[Rockbound]

[quote="spencerfvee"]

[Rockbound]

[Rockbound]

[Rockbound]

[motomwo]

A failure to the supercharger like that has nothing to do with your "tune-up" or gasoline quality, etc..
It failed because:

Some foreign object went into the supercharger

Super charger bearing or bearings failed

The helical cut gears wore severely or come loose causing the rotors to loose their timing.

Or a failure of the rotor lobes (cracked, distorted)

Marty
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1961 Bug, 2276 cb wedge ports 44x37 11.1 comp fk10 1.5 rockers 48idf's 1 3/4" header Rancho pro street trans SAW axles Airkewld 4# narrowed beam, Koni shocks, Airkewld dis brake all around. 5.5/4.5 BRMs

1966 Bug, 2127, panchito heads, fk8, 1.3 rockers, dual 44idfs, 1 5/8 merge header, Rancho pro strt flyer, empi axles, Airkewld's 4" beam and discs all around and adjustable shocks. 4.5 & 5.5 BRMs

[spencerfvee]

[Ohio Tom]